XC Tracer Mini III GPS Firmware Changelog R01: First regular firmware. R02: Minor bug fixes. R03: GPS sentence is now parsed when sentence is fully received. Improves stability and reliability of sensor data fusion code. R04: Small improvements in logger and stringbuilder. Very imporant when you want to update the firmware of XC Tracer Mini III GPS Copy first the new firmware to the SD card, don't remove the USB cable Press the red button and wait! XC Tracer Mini III GPS will finally switch on in USB-MSC mode. Only now switch off XC Tracer Mini III GPS and remove the USB cable. The config file will get updated once the vario is switched on on flight mode.